Sorry for the delay...
I ordered the sheet aluminum from AirParts Inc. in Kansas City.
I had stopped by there last year when we went to pick-up this trailer.
They were really nice, helpful folks.
When I decided to re-do one more side panel and re-do one of my belly pans I ordered one sheet of each from them through the mail.
I used .040 2024 for the new side panels.
That's one size up from the original.
I like the added stability! Definitely recommend that!
For the belly pans I used .032 5052.
That's also one step up from the original.
But for the one piece I ordered to redo the bellypan sheet I didn't like I stepped back down to the original size .025 5052.
I figured the added workability might help me achieve a better finished product.
I think it did.
The .025 is definitely not nearly as sturdy...but I'm sure it's good enough.
You can see in the photo how they ship the sheets...pretty cool!
It was here in a few days and it was only around $30 or so.
I recommend AirParts Inc. wholeheartedly!